DangermouseCLK

Now, normally this would be a good thing but....

05 CLK320 conv. w/68k. When I got it 5 years ago it was whisper quiet and loved it. The first time I changed the air-filters, and the old ones were pretty dirty, there was a noticeable change in engine noise that I put down to better airflow. (I imagined it was like a ram-air sort of sound). At low revs it was noiser but that went away above about 25 mph. And this may be what it should sound like and be un-related to recent developments

However, lately, it has gotten louder and louder. More of a roar, not a usual sounding exhaust leak, but makes the car sound very "uncivilized"

Definitely engine speed related, but doesn't sound transmission related.

New EGR 12 month ago and new crankcase position sensor replacement last month, if relevant. But there was no step-change after either of these repairs

I don't have a video yet and I'm not sure if it would be picked up on one, but I thought I'd describe it and see if it reminds anyone of anything.

beejAMG

i almost spit my coffee when i read your title.

youre right, a lot of V6 owners dream of that and are still dreaming of that.
no matter what high quality muffler or exhaust system they put in their V6, it still wont sound like a V8, i guess it never will.

now back to your "problem", any power loss that you noticed? hopefully you can upload a video so other members can listen.

xsever

I had this phenomenon happen last year and it was more pronounced when I would start the car from cold. It was speed-variable, but as the engine would warm up, the loudness would settle down.

It was the engine mounts. I replaced them and voila, the car was back to whisper quiet. One of the mounts had literally exploded while the other one was near its end-of-life.

I hope this is it for you. Have a mechanic or yourself inspect them and then decide.

DanielFD

yup engine mounts as xsever said. had the same "issue" i did. total bummer back then when the i lost that nice sound. the m112 has a 90 degree V. They are prone to more vibration and eating engine mounts. I changed mine twice in 3 years.

DanielFD

thats with dealer engine mounts.

DangermouseCLK

Thanks. This is why I love forums.

I would have been a long time thinking of engine mounts, but I guess I am getting into the "perished rubber" phase of ownership

I have a set of control arms witing to be installed becasue of persished rubber bushing

Any recommendations on manufacturers to use or avoid?

DIY job or "proper" mechanic? I have done them on other cars, but it all depends on access and ability to prop engine, I guess.


EDIT - I see the lemfoerdner ones are $70, so I'll use them. I'll probably do the trans mount at the same time

xsever

I changed the control arms in the front as well at the 127,000 km mark. Like you said the rubber was deteriorated and cracking. I went with Lemforder and my mechanic friend did the job since you need a special press to remove the bushing from the control arm.

For the engine and transmission mounts, I bought this Lemforder package from Amazon for $160.

Good luck!

Rudeney

The reason engine mounts would cause louder engine noise could just be a greater sense of noise due to additional vibration, but it also could be that it puts stress on the exhaust system and causes the gaskets where the downpipes meet the manifold to leak. The bolts there are spring-loaded so they can flex.

mis3

One way to check your engine mounts:
After you first start your engine (in the morning when engine is cold), if you feel vibration in Drive and if none in Neutral, your engine mounts are due for replacement.

This was exactly my experience and all good after the engine mounts were replaced. I also replaced the transmission mount at the same time.

CDM Motorsports

have a friend help you and put it in gear with foot on brake and give it some gas and see what kind of movement you have. Mounts can cause a vibration and noise. Yes change the transmission mount also.

Good luck

DangermouseCLK

I looked at some videos on YT of engines with failed mounts and there was noticeable movement of the engine. (Going from D to R and back again)

When I checked mine, it seemed minimal, so I was discounting it. Then I checked my X3 and that engine didn't move at all, so now I am not sure.

Here's a couple of vids from indie the cabin, so the detail isn't great. What do you think?

https://www.youtube.com/watch?v=ToEw...ature=youtu.be

and

https://www.youtube.com/watch?v=cTGy...ature=youtu.be

DangermouseCLK

and here are a couple of the sound, as best I could get it, on an empty road

https://www.youtube.com/watch?v=nr8t...ature=youtu.be

and

https://www.youtube.com/watch?v=mPzC...ature=youtu.be

CDM Motorsports

def doesnt sound like mounts.

have you had any work done on the car recently?

DangermouseCLK

Last thing was a crankshaft sensor.

beejAMG

im not sure how a bad engine/transmission mount can make it sound like how you describe it. (even nefore you posted the videos) it will have the shakes and vibrations but minimal effect on the sound.

cant really tell from your videos but it does sound deeper for a 320. did you notice any power loss since? best bet is to bring it to a reputable shop for diagnosis.

DanielFD

well beejAMG, both xsever and I had loud sounding engines at all the whole rpm range, its a sound you here from the interior and not from outside. Replacing the engine mounts changed the engine note from the inside significantly. (sure, the engine note didn't change it was vibration that was causing the v8 sound).

beejAMG

Well DanielFD, did it sound anything like this?

DangermouseCLK

Does the video of the engine moving look like engine mounts to you??

Yes, I will be taking it in, but I believe in being as well prepared as possible before doing so.

DanielFD

Thats was very childish, I hope you feel better now. Sorry I respected you the first time I replied when you basically called me and xsever liars. Second time this week you pick a fight on the forum, you should really tone it down.

beejAMG

Please show me when i actually called you a "LIAR".
Tone it down? Sorry dad i didnt know youre here too.
Btw, maybe when my 63s engine mounts go bad itll sound like a V12.

Edit. its the 2nd time you name drop xsever. You trying to look for others to be on your side? And im "childish" lol

Thats just pathetic.

DanielFD

You called me a liar when you said "it will have a minimum effect on sound" right after xsever and I posted about our hands-on experience on the matter. I decided to not mind it but reply instead. So you posted a video of your V8 while mocking the way i wrote, that to me is as childish as you can get. You made it worse when you called me your dad then you brought up your 63 again.

Childish? Very.

Honestly now, xsever is a very close friend from outside this forum, i dont need to win him over. Neither do i need to win over other people for my side because i dont think this is even an argument. Im not even sure i know what this is.. I shouldnt even have replied but what the hell.

beejAMG

possible that your mounts are goin or already bad. could also be just a coincidence or could be the main culprit.

look, for your own sake, i hope its just the mounts as its a simple and cheap fix. i never once said people are lying nor did i say its not the problem. all i said its highly unlikely.

ive had an E320 with the worst case on engine/transmission mount. i have a V8. and the sound dont even come close.



^now for this guy. i wasnt even talking to you until you quoted my name. then when i post my own video you get offended? people should stop with "the victim" card. its just so pathetic. its the internet ffs. if you can dish it, make sure you can take it as well. dont be such a baby.

beejAMG

are you freaking serious? how is that calling you a liar?
also, if you read through all the comments, not everybody agree with your "mounts theory" 100%. why single me out?
now you can interpret it however way you want it. im not here to please you or worry about your feelings. youre a sad lil thing.

Glyn M Ruck

Guys ~ cut it out or it will be sin bin for a while!

xsever

Please let us know after the mounts are changed if the sound is gone just like with our experience or not. Thank you.